iOS - 毛玻璃效果封装

 #import <UIKit/UIKit.h>
 #import <Accelerate/Accelerate.h>

 @interface UIImage (TY_ImageEditP)
 /**
  *  对图片进行模糊
  *
  *  @param image 要处理图片
  *  @param blur  模糊系数 (0.0-1.0)
  *
  *  @return 处理后的图片
  */
 + (UIImage *)blurryImage:(UIImage *)image withBlurLevel:(CGFloat)blur;

 @end

 1 #import "UIImage+TY_ImageEditP.h"

 @implementation UIImage (TY_ImageEditP)
 + (UIImage *)blurryImage:(UIImage *)image withBlurLevel:(CGFloat)blur {
     if (!image) {
         return nil;
     }
     if ((blur < 0.0f) || (blur > 1.0f)) {
         blur = 0.5f;
     }

     int boxSize = (int)(blur * );
     boxSize -= (boxSize % ) + ;

     CGImageRef img = image.CGImage;

     vImage_Buffer inBuffer, outBuffer;
     vImage_Error error;
     void *pixelBuffer;

     CGDataProviderRef inProvider = CGImageGetDataProvider(img);
     CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);

     inBuffer.width = CGImageGetWidth(img);
     inBuffer.height = CGImageGetHeight(img);
     inBuffer.rowBytes = CGImageGetBytesPerRow(img);
     inBuffer.data = (void*)CFDataGetBytePtr(inBitmapData);

     pixelBuffer = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img));

     outBuffer.data = pixelBuffer;
     outBuffer.width = CGImageGetWidth(img);
     outBuffer.height = CGImageGetHeight(img);
     outBuffer.rowBytes = CGImageGetBytesPerRow(img);

     error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, NULL,
                                        , , boxSize, boxSize, NULL,
                                        kvImageEdgeExtend);

     if (error) {
         NSLog(@"error from convolution %ld", error);
     }

     CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
     CGContextRef ctx = CGBitmapContextCreate(
                                              outBuffer.data,
                                              outBuffer.width,
                                              outBuffer.height,
                                              ,
                                              outBuffer.rowBytes,
                                              colorSpace,
                                              CGImageGetBitmapInfo(image.CGImage));

     CGImageRef imageRef = CGBitmapContextCreateImage (ctx);
     UIImage *returnImage = [UIImage imageWithCGImage:imageRef];

     //clean up
     CGContextRelease(ctx);
     CGColorSpaceRelease(colorSpace);

     free(pixelBuffer);
     CFRelease(inBitmapData);

     CGColorSpaceRelease(colorSpace);
     CGImageRelease(imageRef);

     return returnImage;
 }

 @end

例子~：

  __weak typeof(self) weakSelf = self;
                 [self.myImageView sd_setImageWithURL:[NSURL URLWithString:[ZLModel checkImageUrlNsstring:myModel.address withHttp:TY_IMAGEURL]] placeholderImage:[UIImage imageNamed:consultDefault] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
                     //毛玻璃效果处理
                     UIImage *imageN = [UIImage blurryImage:image withBlurLevel:0.2];
                     weakSelf.imageN = imageN;
                     self.myImageView.image = self.imageN;

                 }];